Millions of people believe they're magical or clairvoyant or some ****. In reality, they're just trying to convince themselves they're "different" and "special" - and with the help of the Placebo Effect they tend to fall for it.

Aside from all the red thumbs, what you have is actually an interesting psychologic phenomenon. Everybody has these prophetic dreams from time to time. The thing is they don't actually occur. What happens is that an instance is 'saved' in the long term memory of your brain instead of the short term. Therefore you instantly believe you had seen this before.

The brain is exceedingly good at tricking you with these kind of things.
Think you can see the future? Maybe your memory is being altered, or you're undergoing mental gymnastics to make them fit.
Think you can sense a persons attributes? You're probably wrong, and if you're not you're probably being very general. An experiment was done where a group of people were given a test, then given a description of their personalities and told it was based on their results, and asked to rate the accuracy. Everyone got the same description, nobody rated it as inaccurate.
Demons? Sleep paralysis, or schizophrenia. I don't know anyone personally, but I have friends who know people with similar experiences. It's always explainable.
If you haven't gone to a doctor about it, you can't trust any of these things as true.

Dude, in all seriousness, delusions of clairvoyance, coupled with auditory hallucinations, are hallmark symptoms of early schizophrenia. You really should check with a doctor, that could be some serious ****.